LTE Base Station Adaptive TBS Selection for Throughput
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Solution Overview
Problem
The LTE REL.12 system experiences a decrease in actual effective coding rate and system throughput due to the use of existing transport block size tables for data transmission, leading to reduced performance compared to LTE REL.8 to REL.11 systems.
Innovation Solution
The base station and user equipment select a larger transport block size corresponding to the modulation and coding level by using either a first or second modulation and transport block size index table, depending on the system configuration and overhead, to determine a higher coding rate and increase system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the base station transmits data to the UE by using a transport block determined according to the existing TBS table in LTE REL.12, then the system overhead becomes smaller, but the actual effective coding rate decreases and system throughput is affected
Solution Approach 1:
The patent introduces a new parameter (second TBS index) that is greater than the first TBS index for the same MCS level, allowing the system to select from multiple TBS indices based on channel conditions. This parameter change enables the base station to transmit more data bits per resource block while maintaining the same overhead structure, thereby increasing throughput without proportionally increasing overhead
Solution Approach 2:
The patent makes the TBS selection dynamic by allowing the base station to choose between different TBS indices (first or second) based on real-time channel quality indicators (CQI) and system conditions. This dynamic adaptation enables the system to optimize the trade-off between overhead and throughput according to current channel states, rather than using a fixed TBS table
2Reliability
If the base station uses a lower MCS level to control bit error rate in poor channel states, then transmission reliability improves, but the coding rate and throughput decrease
Solution Approach 1:
The patent adds a new dimension to the TBS determination process by introducing a second TBS index that operates alongside the traditional first TBS index. This additional dimension allows the system to achieve higher throughput in poor channel conditions by selecting appropriate combinations of MCS level and TBS index, rather than being constrained to a single-dimensional TBS table lookup
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method, a base station, and a user equipment. The data transmission method includes: determining, by a base station, a modulation and coding level and a time-frequency resource, and determining, in a first or second modulation and transport block size index table, a TBS index and a modulation mode, where a second TBS index is not smaller than a first TBS index; and sending service data and a system scheduling control signal to a user equipment by adopting the selected TBS. In this way, the base station can select a larger TBS to achieve a higher coding rate and increase a system throughput.